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Note 10 - Business Segment Information - Segment Activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues	$ 25,973	$ 25,814
Segment contribution	952	1,485
Other expense	(56)	(92)
Tax provision	(217)	(319)
Non-controlling interest	(8)	(15)
Net income attributable to Ultralife	671	1,059
Battery & Energy Products Segment [Member]
Revenues	22,111	20,761
Segment contribution	5,436	5,316
Communications Systems Segment [Member]
Revenues	3,862	5,053
Segment contribution	1,542	2,018
Corporate Segment [Member]
Revenues	0	0
Segment contribution	(6,026)	(5,849)
Other expense	(56)	(92)
Tax provision	(217)	(319)
Non-controlling interest	$ (8)	$ (15)

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